Magnetic head device

Abstract

In a magnetic head device, I-shaped side and center cores are fitted to a slider, and magnetic gaps are formed by a part of the slider. Therefore, a magnetic path can be shortened, and the magnetic head device is constructed so as not to leave strains on the cores, so that the core loss is low. In addition, a back core (back plate) having a wide area is provided, so that heat-dissipating effect is enhanced. Therefore, magnetic field-generating efficiency can be improved in wide frequency bands. Further, by decreasing the number of turns of a coil, the inductance, the impedance, and the loss factor can be reduced.

What is claimed is: 
     
       1. A magnetic head device having a set of cores arranged in proximity to form magnetic gaps therebetween, a coil attached to at least one of said cores for conducting signal conversion between electrical signals and magnetic signals, and a slider for carrying said cores over a recording medium, said cores being secured in their relative positions by a non-magnetic gap material that is filled in said magnetic gaps to improve the magnetic characteristics of said cores, said magnetic head device characterized in that: said slider is formed of a non-magnetic ceramic material and has a top surface and a bottom surface facing said recording medium, said slider including columns standing from said top surface thereof and each having a top end;   said cores are formed of a magnetic material and each have a first end surface and a second end surface, said cores being individually mounted through said slider in such a manner that said first end surfaces of said cores will become substantially coplaner with said bottom surface of said slider and that sections of said slider existing between said cores will form said magnetic gaps and function as said non-magnetic gap material to improve the magnetic characteristics of said cores; and   said magnetic head device further includes a back core formed in the shape of a flat plate the area of which is equal to or larger than the total area of said first end surfaces of said cores plus the total area of said magnetic gaps in said bottom surface of said slider, said back core having a bottom surface joined to said second end surfaces of said cores and said top ends of said columns.   
     
     
       2. A magnetic head device according to claim 1, wherein each of said cores is embedded in each of said columns. 
     
     
       3. A magnetic head device according to claim 2, wherein a suspension is attached to said back core for elastically supporting said magnetic head device. 
     
     
       4. A magnetic head device according to claim 1, wherein a suspension is attached to said back core for elastically supporting said magnetic head device. 
     
     
       5. A magnetic head device according to claim 1, wherein an electrical insulating layer is formed on said bottom surface of said back core. 
     
     
       6. A magnetic head device having a set of cores arranged in proximity to form magnetic gaps therebetween, a coil attached to at least one of sad cores for conducting signal conversion between electrical signals and magnetic signals, and a slider for carrying said cores over a recording medium, said cores being secured in their relative positions by a non-magnetic gap material that is filled in said magnetic gaps to improve the magnetic characteristics of said cores, said magnetic head device characterized in that: said slider is formed of a non-magnetic ceramic material and has a top, surface and a bottom surface facing said recording medium, said slider including columns standing from said top surface thereof and each having a top ends;   said cores are formed of a magnetic material in the shape of an elongated block and each have a first end surface and a second end surface, said cores being individually mounted through said slider in such a manner that the first end surfaces of said cores will become substantially coplanar with the bottom surface of said slider and that sections of said slider existing between said cores will form said magnetic gaps and function as said non-magnetic gap material to improve the magnetic characteristics of said cores; and   said magnetic head device further includes a back core having a bottom surface joined to said second end surfaces of said cores and said top ends of columns.   
     
     
       7. A magnetic head device according to claim 6, wherein each of said cores is embedded in each of said columns. 
     
     
       8. A magnetic head device according to claim 7, wherein a suspension is attached to said back core for elastically supporting said magnetic head device. 
     
     
       9. A magnetic head device according to claim 6, wherein an electrical insulating layer is formed on said bottom surface of said back core. 
     
     
       10. A magnetic head device having a set of cores arranged in proximity to form magnetic gaps therebetween, a coil attached to at least one of said cores for conducting signal conversion between electrical signals and magnetic signals, and a slider for carrying said cores over a recording medium, said cores being secured in their relative positions by a non-magnetic gap material that is filled in said magnetic gaps to improve the magnetic characteristics of said cores, said magnetic head device characterized in that: said slider is formed of a non-magnetic ceramic material and has a top surface and a bottom surface facing said recording medium, said slider including columns standing from said top surface thereof and each having a top ends;   said cores are formed of a magnetic material and each have a first end surface and a second end surface, said cores being individually mounted through said slider in such a manner that said first end surfaces of said cores will become substantially coplaner with said bottom surface of said slider and that sections of said slider existing between said cores will form said magnetic gaps and function as said non-magnetic gap material to improve the magnetic characteristics of said cores; and   said magnetic head device further includes a back core having a bottom surface joined to said second end surfaces of said cores and said top ends of said columns.   
     
     
       11. A magnetic head device according to claim 10, wherein each of said cores is embedded in each of said columns. 
     
     
       12. A magnetic head device according to claim 11, wherein a suspension is attached to said back core for elastically supporting said magnetic head device. 
     
     
       13. A magnetic head device according to claim 10, wherein a suspension is attached to said back core for elastically supporting said magnetic head device. 
     
     
       14. A magnetic head device according to claim 10, wherein an electrical insulating layer is formed on said bottom surface of said back core.